The far infrared spectra of ligand-metal-halide complexes of pseudotetrahedral symmetry

Bradbury, Jonathan; Forest, K.P.; Nuttall, R. H.; Sharp, D. W. A.

doi:10.1016/0584-8539(67)80163-6

Cited by 80 publications

(17 citation statements)

References 5 publications

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“…The low infrared spectrum of this compound shows bands at 176 and 155 cm-' which we have assigned to be the asymmetric and symmetric Co-P stretching vibrations. This agrees with the reported bands for tetrahedral Co(11) phosphine compounds (27). This visible spectra of this compound show a strong absorption band at 15.87 and 16.34 kK which are in agreement for tetrahedral cobalt(l1) (21,28).…”

Section: Class (B) Compozcndsupporting

confidence: 81%

“…The triphenyl phosphine gives absorption bands at 251, 246, 212, 194, and 183 cm-I while CoHg(SCN),.2P@, shows absorption bands at 282, 254, 215, 200, 176, 155, and 128 cm-', respectively. Sharp and co-workers (27) have assigned Co-P stretching bands at 187 (s), 151 (w) in (@,P),CoCl, and at 187 (m), 142 (w) cm-' for (P@,),CoBr, complexes. Hence our bands at 176 and 155 cm-' are due to Co-P for tetrahedral species with C,, symmetry.…”

Section: Class (B) Compozcndmentioning

confidence: 99%

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Cobalt(II) Mercury Tetrathiocyanate Complexes with Lewis Bases

Makhija¹,

Pazdernik²,

Rivest³

1973

Can. J. Chem.

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A new series of octahedral cobalt(II) complexes are formed when CoX2(X = Cl, Br, I, SCN) reacts with Hg(SCN)2 in the presence of Lewis bases. These complexes of stoichiometry CoHg(SCN)4•2L (L = THF, dioxane, pyridine, aniline) are pink to violet solids which slowly decompose to the blue crystalline solid, CoHg(SCN)4, the stable magnetic susceptibility standard. On further reaction of CoHg(SCN)4•2THF with mono-, bi-, and polydentate ligands in dry ethanol, complexes of the following types are obtained: CoHg(SCN)4•2L (L = PΦ3), CoHg(SCN)4•2LL (LL = trien), CoHg(SCN)4•3LL (LL = en, bipy), and CoHg(SCN)4•4LL (LL = phen). The stoichiometry of these were determined by elemental analysis. Possible structures of these are discussed with the help of mid and far infrared, visible, and ultraviolet spectroscopy, magnetic susceptibility, and X-ray powder diffraction. Some new i.r. bands like Co—P, Co—N, and Hg—S are assigned in the low region.

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Section: Class (B) Compozcndsupporting

confidence: 81%

Section: Class (B) Compozcndmentioning

confidence: 99%

Cobalt(II) Mercury Tetrathiocyanate Complexes with Lewis Bases

Makhija¹,

Pazdernik²,

Rivest³

1973

Can. J. Chem.

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“…These bands are assigned in agreement with reference [27]. For the single vibration in the SERS spectrum at 177cm ~ that has no equivalent in the ligand spectra, an assignment to v(Au--P) is proposed according to reference [29]: for example, v(Ni--P) in (Ph)3PNiCI2 was observed at 189cm t.…”

Section: L Assignment Of the Raman And Ir Spectramentioning

confidence: 97%

Giant gold clusters stabilized by triphenylphosphine ligands.

Zimmermann

Wokaun

1991

Molecular Physics

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The binding of a new stabilizing ligand (monosulfonated triphenylphosphine) to the surface of large, monodisperse gold cluster particles is studied by surface enhanced Raman scattering (SERS). From a detailed assignment of the bands, partial information on the adsorption geometry of the ligand onto the colloid surface is obtained. The SERS enhancement is estimated from the experiment, and compared with the theoretical value calculated for the electromagnetic contribution due to local field enhancement. When a sample of the purple colloidal solution is placed on a glass substrate and the solvent is allowed to evaporate, the solid film takes on the appearance of metallic gold; this colour change is reversed upon re-dissolution of the solid. Reflectance spectra have been recorded to characterize the spectral changes occuring, and are interpreted in terms of the Maxwell-Garnett theory for a composite medium consisting of gold spheres in an aqueous host medium.

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“…Table 7-18 contains the results for several LMX a -anion complexes. Bradbury et al 49 have assigned VMN vibrations in terms of a C3v symmetry. The complexes L1.5MXa, where L is bipyridyl or pyrazine, M is In(III) and Tl(III), and X is a halogen, were originally considered to have a structure [InCI2bipY2]+[InCI4bipy]-.…”

Section: Lmx2 Complexesmentioning

confidence: 99%

Metal-Nitrogen Vibrations

Basile¹

1971

Low-Frequency Vibrations of Inorganic and Coordination Compounds

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In recent years considerable effort has been directed toward complexes involving metal-nitrogen bonds. Infrared assignments for the metalnitrogen (VMN) vibration in various coordination complexes have become more numerous. Assignments for the metal-nitrogen bending vibrations have received less attention. In general, the infrared intensity of the VMN vibration is weak to medium in nature, and thus has been the major cause of some confusion in the assignments. Raman investigations of these compounds have been minimal in nature for experimental reasons already mentioned in Chapter 6.The factors determining the position of the VMN vibration are the same as those contributing to the position of the VMX vibration and have previously been discussed. In the case of the metal-nitrogen bond, the bond orders may vary, as was found for the metal-oxygen bond. For metal-nitrogen triple bonds, the stretching frequency may extend as high as --1100 em-I. On the other hand, metal-nitrogen links with a bond order of one appear in the lower-frequency range of 200-300 em-I.The confusion in the metal-nitrogen assignments has centered on the metal-nitrogen vibration in metal (III) ammine complexes. Much of this has been due to the low intensity of this vibration. Deuteration studies and theoretical studies such as the normal coordinate treatment have been very helpful in solving this problem. In particular, the works of Sacconi,1 Griffith,2 and Shimanouchi et al. 3 ,4 have been very valuable. METAL AMMINE COMPLEXESThe metal ammine complexes involve predominantly sigma bonding. However, a n-type overlap for trans [Pt(NHa)2CI2] has been postulated * With Louis J. Basile. 191J. R. Ferraro, Low-Frequency Vibrations of Inorganic and Coordination Compounds

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The far infrared spectra of ligand-metal-halide complexes of pseudotetrahedral symmetry

Cited by 80 publications

References 5 publications

Cobalt(II) Mercury Tetrathiocyanate Complexes with Lewis Bases

Cobalt(II) Mercury Tetrathiocyanate Complexes with Lewis Bases

Giant gold clusters stabilized by triphenylphosphine ligands.

Metal-Nitrogen Vibrations

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